<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in shopCartList" :key="item.id">
          <li class="cart-list-con1">
            <!-- 绑定修改单个商品状态的方法 -->
            <input
              type="checkbox"
              name="chk_list"
              :checked="item.isChecked"
              @input="changeChecked(item.skuId, $event.target.checked ? 1 : 0)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">{{ item.skuName }}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-msg"></div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ item.skuPrice }} </span>
          </li>
          <li class="cart-list-con5">
            <!-- 绑定点击数量-1方法 -->
            <a
              href="javascript:void(0)"
              class="mins"
              @click="changeSkuNum(item.skuNum - 1, item.skuId)"
              >-</a
            >
            <!-- 绑定输入数量方法 -->
            <input
              autocomplete="off"
              type="text"
              minnum="1"
              class="itxt"
              :value="item.skuNum"
              @change="changeSkuNum(+$event.target.value, item.skuId)"
            />
            <!-- 绑定点击商品数量+1方法 -->
            <a
              href="javascript:void(0)"
              class="plus"
              @click="changeSkuNum(item.skuNum + 1, item.skuId)"
              >+</a
            >
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuNum * item.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <!-- 绑定点击删除单个商品方法 -->
            <a
              style="cursor: pointer"
              class="sindelet"
              @click="deleteSkuId(item.skuId)"
              >删除</a
            >
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <!-- 绑定点击全选事件  -->
        <input class="chooseAll" type="checkbox" v-model="allChecked" />
        <span>全选</span>
      </div>
      <div class="option">
        <!-- 绑定删除所有已选中商品的方法 -->
        <a href="#none" @click="deleteAllCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalNum }} </span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ allPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="$router.push('/trade') ">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {
  requestAddOrUpdataNumCart,
  requestShopCart,
  deleteCartList,
  changeChecked,
  changeAllChecked,
  reqDeleteAllCart
} from '@/api'

export default {
  name: 'ShopCart',
  data() {
    return {
      shopCartList: []
    }
  },
  mounted() {
    // 初始化1  请求数据
    this.getShopCartList()
  },
  methods: {
    // 方法1 获取列表
    async getShopCartList() {
      /*
      假报错 原因: 数据是ajax请求回来的  但是初次渲染时 不一定有数据
      解决
       ? 可选链操作符
       || 给一个默认的初始值
      */
      const res = await requestShopCart() || []
      this.shopCartList = res[0]?.cartInfoList || []
    },
    // 方法2 修改某个商品的状态
    async changeChecked(skuId, isChecked) {
      try {
        await changeChecked(skuId, isChecked)
        // 重新请求数据
        this.getShopCartList()
      } catch (e) {
        alert(e.message)
      }
    },
    // 方法3 修改商品数量
    async changeSkuNum(skuNum, skuId) {
      if (skuNum < 1) return
      const nowSku = this.shopCartList.find((item) => item.skuId === skuId)
      try {
        await requestAddOrUpdataNumCart(skuId, skuNum - nowSku.skuNum)
        // 重新发起请求
        this.getShopCartList()
      } catch (e) {
        alert(e.message)
      }
    },
    // 方法4 删除单个商品
    async deleteSkuId(skuId) {
      console.log(skuId)
      try {
        await deleteCartList(skuId)
        this.getShopCartList()
      } catch (e) {
        alert(e.message)
      }
    },
    // 方法5 删除选中商品
    async deleteAllCart() {
      const skuIdList = this.shopCartList.reduce((value, item) => {
        item.isChecked === 1 ? value.push(item.skuId) : ''
        return value
      }, [])
      await reqDeleteAllCart(skuIdList)
      this.getShopCartList()
    }
  },
  computed: {
    // 计算属性1 总价格
    allPrice() {
      return this.shopCartList
      .filter(item => item.isChecked === 1)
      .reduce((pre, cur) => pre + cur.cartPrice * cur.skuNum,0)
    },
    // 计算属性2 总数量
    totalNum() {
      return this.shopCartList
      .filter(item => item.isChecked === 1)
      .reduce((pre, cur) => pre + cur.skuNum, 0)
    },
    // 计算属性3 全选框状态
    allChecked: {
      get() {
        return this.shopCartList.every((item) => item.isChecked === 1)
      },
      async set(val) {
        const skuIdList = this.shopCartList.map((item) => item.skuId)
        await changeAllChecked(val ? 1 : 0, skuIdList)
        this.getShopCartList()
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }
  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;
      & > div {
        float: left;
      }
      .cart-th1 {
        width: 25%;
        input {
          vertical-align: middle;
        }
        span {
          vertical-align: middle;
        }
      }
      .cart-th2 {
        width: 25%;
      }
      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }
    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;
      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;
        & > li {
          float: left;
        }
        .cart-list-con1 {
          width: 15%;
        }
        .cart-list-con2 {
          width: 35%;
          img {
            width: 82px;
            height: 82px;
            float: left;
          }
          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }
        .cart-list-con5 {
          margin-left: 20px;
          width: 17%;
          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }
  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>